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SUBSEQUENT EVENTS: (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended								12 Months Ended
	Mar. 24, 2020	Feb. 20, 2020	Feb. 21, 2019	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
SUBSEQUENT EVENTS
Dividend per share				$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.30	$ 0.30	$ 1.60	$ 1.40
Grupo Mexico and Americas Mining
SUBSEQUENT EVENTS
Dividend per share			$ 0.44428
Settlement dividend paid			$ 36.5
Legal fees paid			$ 13.5
Subsequent Events
SUBSEQUENT EVENTS
Quarterly dividend authorized (in dollars per share)		$ 0.40
Dividend per share	$ 0.40

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- Definition

The total amount of settlement dividend paid to shareholders other than Defendants.

+ References

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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Aggregate dividends declared during the period for each share of common stock outstanding.

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The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

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-Topic 220
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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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